\begin{table}[ht] \centering
\newcolumntype{R}{>{\raggedleft\arraybackslash}X}
\newcolumntype{L}{>{\raggedright\arraybackslash}X}
\newcolumntype{C}{>{\centering\arraybackslash}X}

\caption{Test}
\label{tab:abi_denv}
{\scriptsize
\begin{tabularx}{\raggedleft}{@{}lCCCC@{}}

\toprule
&{(1)}&{(2)}&{(3)}&{(4)} \tabularnewline \midrule
{}&{}&{}&{}&{} \tabularnewline
\midrule \addlinespace[\belowrulesep]
Slow Mean&0.120&0.884&3.807&0.878 \tabularnewline
Fast Mean&0.203&0.996&10.489&1.182 \tabularnewline
P-value&\textbf\{(0.000)\}&\textbf\{(0.000)\}&\textbf\{(0.000)\}&\textbf\{(0.000)\} \tabularnewline
N&1.1e+04&3.1e+04&3.1e+04&3.1e+04 \tabularnewline
Normal Mean&0.156&0.893&4.587&0.942 \tabularnewline
Fast Mean&0.203&0.996&10.489&1.182 \tabularnewline
P-value&\textbf\{(0.000)\}&\textbf\{(0.000)\}&\textbf\{(0.000)\}&\textbf\{(0.000)\} \tabularnewline
N&2.1e+04&5.3e+04&5.3e+04&5.3e+04 \tabularnewline
Slow Mean&0.120&0.884&3.807&0.878 \tabularnewline
Normal Mean&0.156&0.893&4.587&0.942 \tabularnewline
P-value&\textbf\{(0.000)\}&\textbf\{(0.003)\}&\textbf\{(0.000)\}&\textbf\{(0.000)\} \tabularnewline
N&2.2e+04&5.7e+04&5.7e+04&5.7e+04 \tabularnewline
\bottomrule \addlinespace[\belowrulesep]

\end{tabularx}
\\ \parbox{\raggedleft}{\scriptsize Note:}
}
\end{table}
